It's actually a good thought experiment. Giving the franchise to people who have been oppressed for years is a great way of losing control of the system. So, how did they maintain control despite expanding the franchise? They separated voting from land ownership and ensured the power remained with the ownership and not the vote. Voting changed things in and amount the American bourgeoisie before the expansion of the franchise. In preparation for the expansion of the franchise, the American bourgeoisie made voting less and less likely to change anything. This, if voting changed anything, they would make it illegal, and in fact they did, and they made it legal after it wouldn't change anything.